I have only been running for 3 years, and a bad experience with a pair of Nikes at the Tower of Terror 13K forced me to search out something better. A local shop stocked the Spira shoes and they performed very well. Last year's wet Disney Marathon weekend caused me to seek out a second pair of shoes for the full marathon. Against better judgment, but with no other acceptable options, I bought a pair of Spiras at the expo and ran the full marathon in them the next day. Surprisingly, I developed no blisters, no toe nail problems and my feet felt fine the following day. I am going to need new shoes soon, and will get fitted at the local Run n Tri store before making another purchase, but my experience with Spira has been so good it will be a hard time getting me into another brand of shoes.